Roger Bivand pisze:
On Thu, 9 Apr 2009, Jarek Jasiewicz wrote:
Hi
it is difficult to reproduce on spearfish, because there are no data
like this
I vextorised watershed file and at the end of some watershed I have
sutructure like on picture below (rather tipical for watershed):
|
|
+ | __________|_
|_|_
|_|_
|_|_
|_|
Addationaly every square on right-down "stream" has his own centeroid
but with the same cateogry like main centeroid
I import these data to R with readVECT6 and I have more object than
shoud be, because every square became a separtate vector with his own
attributes (some of atrributes are multipied).
In grass I can treat such group as one object by its category number
but in R? How to force R to treat these group of polygons as one obiect
Jarek:
An attempt is made in the code with the remove.duplicates= argument.
In addition for polygons, you can try unionSpatialPolygons() in
maptools to force the objects belonging together into the same
Polygons object.
Hope this helps,
Roger
Jarek
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Yes it is it!
Thank you very much
Jarek
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